LPS-46685 Journal Content JSP cleanup

Hey @natecavanaugh,

I'm resending https://github.com/natecavanaugh/liferay-portal/pull/2421 with most of the changes you proposed. Keep in mind that this was just conceived as a first step towards extracting all the JS code from the JSP's, so we wanted to focus mostly in moving the code around as it was. There's still more to do around Journal, so we can keep improving and cleaning everything you consider necessary.

A couple of comments:

- About the global need for `postProcessTranslation` [comment](https://github.com/natecavanaugh/liferay-portal/pull/2421#discussion_r12653574). We went with the __namespaced event__ approach. Seemed to be, at least, the lesser evil.

- About the event handles cleanup [comment](https://github.com/natecavanaugh/liferay-portal/pull/2421#discussion_r12655257), @ipeychev felt this could use some lengthy discussion. Since he's in Brazil, he'll probably write you an email by the end of the week, or beginning of the next one.

What do you think?

Thanks!